chr16-81096226-G-T

Variant names:

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 0P and 2B. BP4_Moderate

The NM_004483.5(GCSH):c.53C>A(p.Ala18Glu) variant causes a missense change involving the alteration of a non-conserved nucleotide. In-silico tool predicts a benign outcome for this variant. 14/22 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A18V) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.0 ( 0 hom., cov: 33)

Exomes 𝑓: 8.6e-7 ( 0 hom. )

Failed GnomAD Quality Control

Consequence

GCSH
NM_004483.5 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 0.391

Publications

1 publications found

Variant links:

Genes affected

GCSH (HGNC:4208): (glycine cleavage system protein H) Degradation of glycine is brought about by the glycine cleavage system, which is composed of four mitochondrial protein components: P protein (a pyridoxal phosphate-dependent glycine decarboxylase), H protein (a lipoic acid-containing protein), T protein (a tetrahydrofolate-requiring enzyme), and L protein (a lipoamide dehydrogenase). The protein encoded by this gene is the H protein, which transfers the methylamine group of glycine from the P protein to the T protein. Defects in this gene are a cause of nonketotic hyperglycinemia (NKH). Two transcript variants, one protein-coding and the other probably not protein-coding,have been found for this gene. Also, several transcribed and non-transcribed pseudogenes of this gene exist throughout the genome.[provided by RefSeq, Jan 2010]

GCSH Gene-Disease associations (from GenCC):

glycine encephalopathy
Inheritance: AR Classification: STRONG, LIMITED Submitted by: ClinGen, Ambry Genetics
multiple mitochondrial dysfunctions syndrome 7
Inheritance: AR Classification: STRONG, MODERATE Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics, G2P
infantile glycine encephalopathy
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
neonatal glycine encephalopathy
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
atypical glycine encephalopathy
Inheritance: Unknown Classification: SUPPORTIVE Submitted by: Orphanet

GCSH links:

ENSG00000284512 (HGNC:):

ENSG00000284512 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -2 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.095293194).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
GCSH	NM_004483.5 link	c.53C>A	p.Ala18Glu	missense_variant	Exon 1 of 5	ENST00000315467.9	NP_004474.2	P23434
GCSH	XM_017023136.3 link	c.53C>A	p.Ala18Glu	missense_variant	Exon 1 of 5		XP_016878625.1
GCSH	NR_033249.2 link	n.170C>A		non_coding_transcript_exon_variant	Exon 1 of 4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
GCSH	ENST00000315467.9 link	c.53C>A	p.Ala18Glu	missense_variant	Exon 1 of 5	1	NM_004483.5	ENSP00000319531.3	P23434
ENSG00000284512	ENST00000640345.1 link	c.53C>A	p.Ala18Glu	missense_variant	Exon 1 of 6	5		ENSP00000492798.1	A0A1W2PS29
ENSG00000260643	ENST00000564536.2 link	c.53C>A	p.Ala18Glu	missense_variant	Exon 1 of 6	5		ENSP00000491651.1	A0A1W2PPQ1

Frequencies

GnomAD3 genomes

AF:

0.00

AC:

AN:

152032

Hom.:

Cov.:

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.00

AC:

AN:

930

AF XY:

0.00

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

Data not reliable, filtered out with message: AS_VQSR

AF:

8.60e-7

AC:

AN:

1162466

Hom.:

Cov.:

AF XY:

0.00000178

AC XY:

AN XY:

562860

show subpopulations

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.0000430

AC:

AN:

23262

American (AMR)

AF:

0.00

AC:

AN:

9018

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

15566

East Asian (EAS)

AF:

0.00

AC:

AN:

26958

South Asian (SAS)

AF:

0.00

AC:

AN:

41436

European-Finnish (FIN)

AF:

0.00

AC:

AN:

26846

Middle Eastern (MID)

AF:

0.00

AC:

AN:

3170

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

969116

Other (OTH)

AF:

0.00

AC:

AN:

47094

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.000000), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.225

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

Data not reliable, filtered out with message: AC0;AS_VQSR

AF:

0.00

AC:

AN:

152032

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74266

African (AFR)

AF:

0.00

AC:

AN:

41430

American (AMR)

AF:

0.00

AC:

AN:

15266

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

5174

South Asian (SAS)

AF:

0.00

AC:

AN:

4830

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10576

Middle Eastern (MID)

AF:

0.00

AC:

AN:

312

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

67974

Other (OTH)

AF:

0.00

AC:

AN:

2088

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.17

BayesDel_addAF

Benign

-0.16

BayesDel_noAF

Benign

-0.46

CADD

Benign

(source)

DANN

Benign

0.87

DEOGEN2

Benign

0.12

.;.;.;T;.;.;.

Eigen

Benign

-1.2

Eigen_PC

Benign

-1.3

FATHMM_MKL

Benign

0.060

LIST_S2

Benign

0.43

T;T;T;T;T;T;T

M_CAP

Uncertain

0.25

MetaRNN

Benign

0.095

T;T;T;T;T;T;T

MetaSVM

Benign

-1.1

MutationAssessor

Benign

1.9

.;.;.;L;.;.;.

PhyloP100

0.39

PrimateAI

Uncertain

0.74

PROVEAN

Benign

-1.2

.;.;.;N;.;.;.

REVEL

Benign

0.045

Sift

Benign

0.25

.;.;.;T;.;.;.

Sift4G

Benign

0.066

.;.;.;T;.;.;.

Polyphen

0.36

.;.;.;B;.;.;.

Vest4

0.14

MutPred

0.28

Gain of solvent accessibility (P = 0.0109);.;Gain of solvent accessibility (P = 0.0109);Gain of solvent accessibility (P = 0.0109);Gain of solvent accessibility (P = 0.0109);Gain of solvent accessibility (P = 0.0109);.;

MVP

0.17

MPC

0.51

ClinPred

0.12

GERP RS

-1.3

PromoterAI

0.090

Neutral

(source)

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.0

Varity_R

0.090

gMVP

0.48

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.010

Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over